It's common to breed a Holstein to an Angus. Then you get milk from the Holstein and eat the calf, which should be, perhaps not as beefy as an Angus, but a lot meatier than the Holstein.
That's also done with Jersey cows bred to a beef type Dexter.
Milking Shorthorns are better muscled than a lot of other dairy breeds.
You are using 1/2 a gallon a day..... a milk cow is going to give you 5-6 gallons a day if she is well fed and well bred. You will have a lot of milk to figure out what to do with.
I don't keep milk cows because I don't want to do all that work and to be tied down to such a precise schedule. But if i did, I'd buy a quality jersey and have her AI'ed to a top of the line Jersey bull for a purebred jersey calf. A bull calf would be worth nothing, but Jersey is exceptionally good to eat, just small. A heifer calf would be worth a packet as a purebred milk cow. Train her to halter and get her ready to be hand milked and she will sell for enough to buy a beef feeder steer.